Razor-stropping device



Nov. 3,1925.

A. J. POSTANS RAZOR STROPPING DEVICE}.

Filed Oct. 27. 1924 Patented Nov. 3, 1925.

UNITED STATES PATENT OFFICE.

ARTHUR JAMES POSTANS, OF LEAMINGTON SPA, ENGLAND, ASSIGNOR TO W. J. MYA'I'T & COMPANY LIMITED, OF BIRMINGHAM, ENGLAND.

RAZOR-STROPPING DEVICE.

Application filed October 27, 1924-.

To all whom it may concern) Be it known that I, ARTHUR JAMES Pos- 'IANS, a British subject, residing at 34 Learn Terrace, Leamington Spa, in the county of lVarwick, England, have invented certain new and useful Improvements Relating to Razor-stropping Devices, of which the following is a specification.

This invention relates to razor stropping devices and particularl to safety razors or stropping devices therefbr in which the blade holder is adapted to be swung from one position to another at the end of each stropping movement so that the opposite sides of the blade are acted on alternately.

Experience proves that it is desirable, especially in the case of safety razor blades, to subject one side of the blade to a rather stronger stropping action than the other. Apparently in the act of shaving, the edge of the blade is apt to be turned back in the direction away from the guard, and a condition in satisfactory stropping is that this effect shall be counteracted.

The present invention comprises the adaptation of the stropping mechanism to cause greater pressure to be exerted between the blade and stropping surface in one stroke than in the next.

In particular the invention comprises the employment of eccentric toothed pinions, or eccentric roller or other mechanism for imparting the successive-swinging movements to the blade holder.

In the accompanying sheet of explanatory drawings Figure 1 is a side elevation, and Figure 2 a front elevation showing one application of the invention to a safety razor.

Figures 3 and 4e are diagrams illustrating the action of the stropping mechanism.

In one well known form of safety razor (illustrated in Figures 1 and 2) the blade holder at is mounted in conjunction with the handle 6 and guard c in such a. manner that when reciprocated relatively to a strop d (Figures 3 and 4) which is threaded under side rollers f, the roller 0 Serial No. 746,158.

a roller e beneath the blade holder and over is alternately rotated in opposite directions, and this movement is utilized for swinging the blade holder through about 180 at the end of each stroke by connecting the roller and blade holder through a pair of toothed pinions as g, each pinion being arranged coaxially on the part on which it is mounted.

In one simple application of the invention to razors of this kind, the pinions g are arranged eccentrically, so that in the one directlon of travel the turning moment exerted on the blade holder by the frictional engagement between the strop and roller (and consequently the pressure between the blade 7L and strop) is greater than in the other. By such a provision it is found that much more satisfactory stropping of the blades is obtained than with the ordinary device. The action of the eccentric arrangement of pinions will be evident from Figures 3 and 4. Figures 3 shows the parts in the relative positions which'cause the maximum pressure to be exerted between the blade and strop. I The direction of movement ofythe razor relatively to the strop is indicated by the arrow. In the next and opposite stroke in which the direction is as shown by the arrow in Figure 4, the parts take up the position shown in that figure, and a less pressure is then set up between the blade and strop.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is I In razor stropping devices, the combination comprising a strop, an oscillatory blade holder, a roller in frictional engagement with the strop, and eccentric pinions for transmitting motion from the roller to the blade holder for causing greater pressure to be exerted between blade and strop in one stroke than in the next.

In testimony whereof I have name to this specification.

ARTHUR JAMES POSTANS. 

